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Our QA reported a problem caused by movntdqa instructions. Currently, the KVM hypervisor doesn't support VEX-prefix instructions emulation. If users passthrough a GPU to guest with vfio option 'x-no-mmap=on', then all access to the BARs will be trapped and emulated. The KVM hypervisor would raise an inertal error to qemu which cause the guest killed. (Since 'movntdqa' ins is not supported.) This patch try not to enable movntdqa optimization if the driver is running in hypervisor guest. Signed-off-by: Changbin Du <changbin.du@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1513924309-3113-1-git-send-email-changbin.du@intel.com Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.